EP1166435A1 - Non-linear distortion generator - Google Patents
Non-linear distortion generatorInfo
- Publication number
- EP1166435A1 EP1166435A1 EP00919766A EP00919766A EP1166435A1 EP 1166435 A1 EP1166435 A1 EP 1166435A1 EP 00919766 A EP00919766 A EP 00919766A EP 00919766 A EP00919766 A EP 00919766A EP 1166435 A1 EP1166435 A1 EP 1166435A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit
- linear
- signal
- distortion
- coupled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3276—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using the nonlinearity inherent to components, e.g. a diode
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
- H03F1/303—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters using a switching device
Definitions
- the present invention relates generally to communication systems employing
- the invention pertains to a non-linear
- predistortion or postdistortion generator for coupling in-line with an amplifier
- optical detector or laser to minimize the signal distortion caused by amplification.
- Amplifiers are widely used in many types of communication applications.
- Minimizing distortion is particularly important when a series of amplifiers is
- a signal transmission path such as a series of RF amplifiers in a
- CATV transmission system Disposed throughout a CATV transmission system are
- RF amplifiers that periodically amplify the transmitted signals to counteract cable attenuation and attenuation caused by passive CATV components, such as, signal
- the RF amplifiers are also employed to maintain the desired
- each RF amplifier must provide minimum degradation
- CTB composite triple beat
- NLD reduce the signal power level
- the first method reduces the
- the second method is the feed forward technique. Using this technique, the
- This distortion component is extracted. This distortion component is then amplified by
- This circuitry is also complex and very temperature
- the third method is the predistortion or postdistortion technique.
- predistortion or postdistortion is used.
- This circuit generates a distortion that is equal in amplitude but
- circuitry disclosed therein is not matched to the NLD. Additionally, the '854
- the present invention is an in-line predistortion or postdistortion generator
- generator comprises an instant controlled non-linear attenuator which utilizes the non-linear current flowing through a pair of diodes to provide the proper amount of
- circuitry is always matched to the NLD, thereby ensuring a frequency response that
- the distortion generator also includes a temperature
- NLD such as an RF amplifier, a laser diode
- Figure 1 is a schematic diagram of a prior art distortion generator.
- Figure 2 is a combination plot of the effect of using the outputs from the prior
- Figure 3 is a combination plot of the effect of using the outputs from the prior
- Figure 4 is schematic diagram of a ⁇ attenuator.
- Figure 5 is a signal diagram of the diode non-linear current caused by the
- Figure 6 is a schematic diagram of the preferred embodiment of the distortion
- Figure 7 is a schematic diagram of the temperature compensation circuit.
- the network 20 comprises a selected
- the signal source is input at signal
- Z j is the source of internal impedance which should be equal to the system
- impedance Z 0 which is seen across the output 95.
- the impedance values Z, and Z 0 are equal to
- the values (Y) of resistors R 2 and R 3 are equal, and substantially larger
- resistor R p is connected in parallel with resistor
- the attenuator network 20 is matched at input and output, from D.C. to very high
- Equation (8) shows that when R p (375 ohms) is in parallel with W x (7.5 ohms), the
- the attenuator network 20 as shown is a linear
- diodes are used to
- Schottky diodes are utilized. At small current, diode current is exponentially proportional to the voltage across over the
- diode can be used as a non-linear resistance.
- the amount of attenuation can be calculated as:
- I p is the current flow through R p , (the non-linear resistance).
- I j is the
- Equation 9 provides the relationship of the attenuation
- Equation 9 provides a good estimation of how much non- linear current is required
- I nonlinear Ii - 2 h + h Equation (10)
- I non . l ⁇ near eff in Equation 12 is the effective non-linear current
- Equation 13 shows that only a small
- the ⁇ attenuator network 20 has low insertion loss and the voltage drop of
- the input voltage on R x (shown in Figure 4) is proportional to the input voltage.
- This voltage may be used to drive a pair of diodes to produce non-linear current.
- the non-linear current flowing in the diodes will cause an attenuator to provide less
- This may be used to compensate for the signal compression caused by amplification.
- invention includes several additional components that modify a traditional ⁇ attenuator to achieve significantly better performance over a wide frequency and
- the attenuator 100 has an input port 101, an output port 114 and
- the attenuator 100 may be used in a predistortion
- the output port 114 is connected to the input of an
- the attenuator 100 is applied to the input port 101.
- the attenuator 100 is applied to the input port 101.
- resistors 105, 106, 107, 108, 112 includes resistors 105, 106, 107, 108, 112; capacitors 102, 103, 104, 111, 113, 115;
- the inductor 117 is used in series with the resistor 108.
- the function of the inductor 117 is used in series with the resistor 108.
- inductor 117 is to make a parallel resonance circuit with the forward biased diode
- 111, 113, and 115 are also used for D.C. blocking and AC coupling. From an AC
- resistors 105 and 106 are equivalent to resistor R 2 of Figure 4.
- resistors 105 and 106 are equivalent to resistor R 2 of Figure 4.
- resistor 112 and capacitor 111 is functionally equivalent to resistor R 3 of Figure 4.
- resistor 107 has no effect on RF signal attenuation.
- resistors 105, 106, and 107 The other function for resistors 105, 106, and 107 is to supply a D.C. bias to
- the diodes 109, 110 are first connected in series; and the series
- resistor 107 has a low
- the diodes 109, 110 will be primarily determined by the resistance of resistor 107.
- resistor 107 in parallel with capacitors 103 and 104,
- resistor 107 will
- Diode 109 is connected to resistor 108 through capacitor 104 while diode 110
- Diode 109 is responsible for the
- capacitors 103 and 104 have the same value but different signs.
- the present invention has several unique advantages over the prior art. Due to
- the attenuator 100 produces only odd order distortion.
- the attenuator 100 also uses two low series resistances 107, 108. From a D.C.
- resistor 107 significantly improves the correction efficiency and reduces
- resistor 108 provides for distortion correction with low insertion losses. Due to the
- circuitry and delay lines This permits a circuit design which is much less complex
- the present attenuator design uses low series resistance 108.
- the third order correction circuit may work over a wide frequency range and
- This correction circuit design is flexible and may be
- This circuit is always matched to its input side and output side over wide frequency
- Table 1 provides a listing of the components shown in Figure 6. However,
- the value of resistor 108 may range from approximately 2 ⁇
- resistor 107 may range from approximately 100 ⁇ to
- the attenuator 100 uses the non-linear current
- the attenuator 100 comprises capacitance, resistance and two
- the diodes are the only components that are sensitive to temperature change
- NLDs typically exhibit more distortion as the ambient temperature rises.
- the temperature compensation circuit 200 is shown. The temperature compensation circuit 200
- the temperature compensation circuit 200 As shown, the temperature compensation circuit 200
- the negative temperature coefficient thermistor 211 is coupled in parallel with
- resistor 210 to form a temperature linearized resistance, which is correlated to a
- the PNP transistor 206 provides a constant current source
- variable resistor 202 the amount of constant current through the PNP transistor
- the voltage swing over temperature can be changed.
- the constant current also passes through the variable resistor 209, thereby creating
- the two diodes 205 and 208 are used to compensate for the junction voltage of the
- Table 2 provides a listing of the components shown in Figure 7. However,
- temperature compensation circuit 200 as disclosed herein is not utilized, the preferred
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US282958 | 1999-04-01 | ||
US09/282,958 US6577177B2 (en) | 1999-04-01 | 1999-04-01 | Non-linear distortion generator |
PCT/US2000/008255 WO2000060734A1 (en) | 1999-04-01 | 2000-03-29 | Non-linear distortion generator |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1166435A1 true EP1166435A1 (en) | 2002-01-02 |
EP1166435B1 EP1166435B1 (en) | 2003-09-10 |
Family
ID=23083869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00919766A Expired - Lifetime EP1166435B1 (en) | 1999-04-01 | 2000-03-29 | Non-linear distortion generator |
Country Status (12)
Country | Link |
---|---|
US (1) | US6577177B2 (en) |
EP (1) | EP1166435B1 (en) |
KR (1) | KR20010111287A (en) |
CN (1) | CN1345478A (en) |
AT (1) | ATE249693T1 (en) |
AU (1) | AU761636B2 (en) |
CA (1) | CA2368578A1 (en) |
DE (1) | DE60005163T2 (en) |
ES (1) | ES2206218T3 (en) |
MX (1) | MXPA01009899A (en) |
TW (1) | TW498603B (en) |
WO (1) | WO2000060734A1 (en) |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003243939A (en) * | 2002-02-14 | 2003-08-29 | Seiko Epson Corp | Distortion compensation circuit |
US6985020B2 (en) * | 2002-07-09 | 2006-01-10 | General Instrument Corporation | Inline predistortion for both CSO and CTB correction |
DE10361434B3 (en) * | 2003-12-23 | 2005-09-15 | Hußenöder, Helmut | Stiffening device for a glove, in particular goalkeeper glove |
US7194012B2 (en) * | 2004-04-05 | 2007-03-20 | Finisar Corporation | Laser driver circuit for externally modulated lasers |
WO2006020695A2 (en) * | 2004-08-12 | 2006-02-23 | Triaccess Technologies, Inc. | Optical receiver with increased dynamic range |
US7557654B2 (en) * | 2004-10-28 | 2009-07-07 | Mitsubishi Electric Corporation | Linearizer |
JP4704154B2 (en) * | 2005-09-02 | 2011-06-15 | 三菱電機株式会社 | Diode switch and attenuator |
US7809282B2 (en) * | 2006-05-12 | 2010-10-05 | General Instrument Corporation | Dispersion compensating circuits for optical transmission system |
US7634198B2 (en) * | 2006-06-21 | 2009-12-15 | Emcore Corporation | In-line distortion cancellation circuits for linearization of electronic and optical signals with phase and frequency adjustment |
US7925170B2 (en) * | 2007-08-07 | 2011-04-12 | Applied Optoelectronics, Inc. | Predistortion circuit including distortion generator diodes with adjustable diode bias |
US8073340B2 (en) * | 2008-02-05 | 2011-12-06 | Applied Optoelectronics, Inc. | Distortion compensation circuit including one or more phase invertible distortion paths |
US8121493B2 (en) * | 2008-02-05 | 2012-02-21 | Applied Optoelectronics, Inc. | Distortion compensation circuit and method based on orders of time dependent series of distortion signal |
EP2164170A1 (en) * | 2008-09-15 | 2010-03-17 | Forschungsverbund Berlin E.V. | Self-adjusting gate bias network for field effect transistors |
US9191111B2 (en) * | 2008-10-03 | 2015-11-17 | Applied Optoelectronics, Inc. | Reducing cross-modulation in multichannel modulated optical systems |
US8320773B2 (en) * | 2008-10-03 | 2012-11-27 | Applied Optoelectronics, Inc. | Reducing cross-modulation in multichannel modulated optical systems |
US7944323B2 (en) * | 2009-01-06 | 2011-05-17 | Skyworks Solutions, Inc. | Temperature-compensated PIN-diode attenuator |
US8606116B2 (en) | 2011-01-13 | 2013-12-10 | Applied Optoelectronics, Inc. | System and method for distortion compensation in response to frequency detection |
US8891974B2 (en) | 2012-03-30 | 2014-11-18 | Applied Optoelectronics, Inc. | Distortion compensation circuit including tunable phase path |
US8787773B2 (en) | 2012-05-09 | 2014-07-22 | Motorola Mobility Llc | Electronic dispersion correction circuit for optical transmission system |
US8750724B2 (en) | 2012-05-09 | 2014-06-10 | Motorola Mobility Llc | Electronic dispersion correction circuit for optical transmission system |
JP2015222912A (en) * | 2014-05-23 | 2015-12-10 | 三菱電機株式会社 | Linearizer |
CN106711560B (en) * | 2016-11-24 | 2020-12-01 | 苏州市新诚氏通讯电子股份有限公司 | High-power aluminum nitride ceramic substrate 100W attenuation sheet and production method thereof |
WO2020087367A1 (en) * | 2018-10-31 | 2020-05-07 | 华为技术有限公司 | Temperature-compensation circuit and phased array device |
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US4882482A (en) | 1988-10-26 | 1989-11-21 | Tektronix, Inc. | Thermally stabilized optical preamplifier |
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-
1999
- 1999-04-01 US US09/282,958 patent/US6577177B2/en not_active Expired - Lifetime
-
2000
- 2000-03-29 AT AT00919766T patent/ATE249693T1/en not_active IP Right Cessation
- 2000-03-29 CN CN00805840A patent/CN1345478A/en active Pending
- 2000-03-29 EP EP00919766A patent/EP1166435B1/en not_active Expired - Lifetime
- 2000-03-29 AU AU40397/00A patent/AU761636B2/en not_active Ceased
- 2000-03-29 MX MXPA01009899A patent/MXPA01009899A/en active IP Right Grant
- 2000-03-29 WO PCT/US2000/008255 patent/WO2000060734A1/en not_active Application Discontinuation
- 2000-03-29 CA CA002368578A patent/CA2368578A1/en not_active Abandoned
- 2000-03-29 ES ES00919766T patent/ES2206218T3/en not_active Expired - Lifetime
- 2000-03-29 DE DE60005163T patent/DE60005163T2/en not_active Expired - Fee Related
- 2000-03-29 KR KR1020017012510A patent/KR20010111287A/en not_active Application Discontinuation
- 2000-03-31 TW TW089106053A patent/TW498603B/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO0060734A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2000060734A1 (en) | 2000-10-12 |
DE60005163D1 (en) | 2003-10-16 |
KR20010111287A (en) | 2001-12-17 |
US20010054927A1 (en) | 2001-12-27 |
EP1166435B1 (en) | 2003-09-10 |
MXPA01009899A (en) | 2003-07-28 |
US6577177B2 (en) | 2003-06-10 |
TW498603B (en) | 2002-08-11 |
AU4039700A (en) | 2000-10-23 |
ES2206218T3 (en) | 2004-05-16 |
ATE249693T1 (en) | 2003-09-15 |
DE60005163T2 (en) | 2004-07-22 |
AU761636B2 (en) | 2003-06-05 |
CA2368578A1 (en) | 2000-10-12 |
CN1345478A (en) | 2002-04-17 |
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